renki n



, W. O. RENKBN.

COMBINED AIR AND PULVERIZED FUEL CONTROL.

APPLXCATION FILED mm. 31. I918.

Patented July 1, 1919.,

v 3 SliEETS-SHEET I.

r m |NVENTOR K jffWVWLE ATTORNEY W. 0. RENKIN. COMBINED AIR AND PULVERIZED FUEL CONTROL.

IAPPL[CAT\ON FILED JAN-31.1918.

Patented July 1, 191%}.

3 SHEET$$HEET 2 mww APPLICATION FILED JAWS], 19H) Patented July 1, 1919.

3 SHEETS-SHEET 3.

-'INVENTCR ATTORNEY ti l it ii fuel to supportcombustion.

l lflllllfillltl lll if}. lltllill lllllll', 035i ORIMDELL, NEW JERSEY, ASSIGNU SlEElJlUALTIES 00.. INCL, A CIOJEtJEURAIKIfil l OF N "i TC QUIGLEY'IURNAGE llGlllEltlIhlEl] AIR AND PULVIEltIlllElWFUEL lflfilll'lllllrtflli.

ire-reason.

Specification of Letters Patent.

i ialented duly l, illllllt.

application. filed January 3i, one. Serial No. mil-R551.

systems the finely pulverized coal is driveir into the coinlmstimi chamber by a jet or current of compressed air and at the furnace inlet a larger volume of low pressure air, called secondary air. is also mixed with the The secondary air has heretofore been regulated independently of the primary or fuel driving air. This requires the exercise of much, skill and {,Z'OOtl jildnment hy the operator. When unskilled labor employed it is Well, however, to have the proper proportion of fuel and air insured at all times by connecting together the two means for regulation so that they may he simultaneously operated from one hand wheel or similar device and so antomatically preserve a predetermined ratio hetweon air and fuel supplies. The con trolling means for a bank of furnaces may he thus all operated from one point.

The hcst form cl. apparatus embodying my invention at present known to me is illusarated in the accompanying three sheets of drawing in which Figure 1 is a side elevation (With certain parts shown in section) of a series of furnaces each equipped with a. separate pulver izcd fuel burning apparatus, in which the air and fuel supply may be jointly and simultanoously operated from one controlling hand wheel. or in which the fuel and air may be separately regulated, as may be preierrcd. 4

Fin. 2 is a front elevation of furnaces and apparatus. p

Fig. 3 is a plan view thereof.

Fin. 4-, is a detail plan view and Fig. 5 is a cross section on line 55 of Fig. 4, showing;- the preferred form of slide valve or gate for controlling the air supply in an arrangement for jointly regulating the fuel and air such as is illustratedin Figsrl, 2 and 'lhroughout the drawings like reference charactersindicatelike parts. 234, 234 and 23-h, represent three furnaces supplied with l pulvcrized fuclyl'roiu three controllers 29ml,

224- and 22-1", and with. secondary 1-folcombustion from blast pipr-ra 225 and 225". .llach linnace has a burner can, 226"", or 226 of construction usual in plants of this kind to which the pulverized fuel is brought on a current of uiir :unde'r more or less n'essure, from its fuel controller. through pipe 227 or A. supply of pulverizedcoal is stored 1n hin from which it flows down through gates 2Y 120i and st to the'several controllers 22 i and 224; which may he of the cons notion described in my application Serial No. illlllfi itl, tiled Nov. 30, 1917. These controllers are oper ated from an electric motor 229, through belt 230., countershait 231 and bolts and 2352 running over pulleys 300 5300, and

300 on the respective controllers T his apparatus is supported. on -:l1.'an:uz\rvorl 233. The secondary air tor each furnace is controlled hy a regulating valve 236, 236 or 236", and a hand ope'ated shut oil' gate 235, 235, or 235". When the fuel and air supplies are 'to he contemporaneously graduated by the mechanism next to he dcscribed the proportion of secondary air to fuel in the several furnaces is lined by ad justment of the several shut oll gates, 235,

lid

till

235 and 235", and such proportion thereafter remains constant.

The fuel. controllers 52248 and 224:", are all regulated in unison from hand Wheel "237, which is mounted on and revolves with an internally threaded sleeve which-moves longitudina lly a screw threaded rod. similar to the one marked 238 in Fig. 2, but-Which does not show in said figure of drawing because it is behind 238. has a pin. and eye connection to the end of crank 239, on bell crank shaft 240. This shaft 2&0 carries a toothed. sector 2&1, which meshes with pinion 242 on shaft 243. At the other end of shaft 248 (see Fig.1) is a sprocket wheel and chain connection 29?,to countcrshaft 255 which carries three sprocket wheel and chain operating connections 24:4, 244 and 24-1". to the shutter regulating screws 245, 2% and 245 of the respective fuel controllers. Rotation of hand wheel 237, will open or close all of these controller This screw threaded rod shutters and so simultaneously regulate the another :u'ljustingscrew 238, connected to the upper end of vertical lever 2&7, the lower end of which is fast upon the horizontal shaft 29%;, carrying bevel gear 295, which meshes with the bevel gear 248, which is fast on horizontal shaft 2119 which runs in front of the furnaces adjacent to, and to the rear of the secondary air pipes 2:25 and 22o, and is mounted in bearings 296. A

valve lever 250, 250 or 250", is fast on shaft 244 back or" each secondary pipe and extends downward to the level of the cor- I b responding n11 regulating valve 236, 236

or 236". and has its lower, free end connected to such valve -by link Q51, 251 or with an intermediate gear "which is m on a l ed on a swinging lever or latch (best shown in Fig. 1). When the latch is up in the position shown in Fig. 1, the hand wheels are geared. together so that when the operator rotates either one, regulation of both the controllers 2251-, 22-? and 224", the fuel supply and of air valves 236, 1.36 and 23G of the secondary air supply results simultaneously and to the same extent.

In Figs. and 5 is shown the preferred form of valve 236, which is in theform of a flat plate l'iaving a number of openings through it. arranged to register with similar openings 260, of the same size. in the valve seat. A valveot this kind distributes the air pz'issing through it evenly around the entire cross section of the air pipe and secures an even. exactly graduated flow of air which would not result it one large opening were cmployed instead of the numerous small openings shown.

The port openings 259 and 260 are so designed. and the movements of the valves relative to that of the shutters of the fuel cm'ltrollcrs are so regulated that a predetermined proportion of fuel and secondary air will be maintained at the bu ners by the sinmltaiwous operation of the two mechanisms in the manner described.

in operation the shutoff valves 235, 235 and 235" would be adjusted by a skilful operator so as to supply enough sccomlary air for the highest allowable rate of coup bastion in the corrcspoiulingfurnac and thereafter tl o regulation for lesser rates of combustion would be secured through manipulation by any one cl valves Jilin zoo" andltlfi", through the apparatus herein dc scribed in unison with proper correspomlin g' regulation of the fuel supply therchy.

.lt. is to be mulerstoodjthat in the fuel controllers 224, 2% and 22-h. the powdered coal is dropped into a jet of high pressure air which blows it into the combustion chamberof the furnace. This jetrcmains constant.

employed to support combustion consists of the so-Callcd secoiulary air supplicd through large blast pipes 25, 225" and 23.3 at a relatively low pressure. li-opcr control of the rate of fuel consumption. while maintaining complete combustion o'l such fuel as is supplied, therefore a qui-stiou of first properly proportioniug the amounts of coal and secondary air cmploycd and then maintaining that proportion for dill'crcut rates of combustion by moving the sup plies of fuel and of secondary air proportionately, as by the mechanism herciubol'o'rc described. This will secure substantially correct resultsbecause the uniform amount of high pressure air used in the coal discharging jet is relatively so small that it does not appreciably atlect the total varia tion. of air quantities supplied to the combustion chamber. l

Having described my iuvcutioin l claim:

1. An apparatus for burning finely powdered fuel which has, in combination means for producing a constant jet of high pres ure air for injecting the fuel into a combustiou chamber, separate means for feeding air for combustion to said chamber. apparatus for 'urying the amount of fuel 'lcd to iluhigh pressure jet. a valve for varying the amount of air supplied to the furnace 'lor com-- bustion. and'a device for connecting thcsc fuel and air controlling: sets of means iogethcr so that they will operate synchronously and proportionatcly.

2. An apparatus such as is dcscribcd in claim 1. combined with a second hand-operatcd valve controlling the maximum (Illillh tity of air which may be supplied (or combustion.

\VILLIAM lllCIQ K 13.

i tncsscs 

